Laser addressed display

Details Laser addressed display Laser addressed display

1976-09-29

1978-06-06

Wilbur, Maynard R.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

340166EL, 358241, H01J 3150, H01J 3912

Patent

active

040938522

ABSTRACT:
A photoconductor-switched electroluminescent matrix panel for use in a laser-addressed tactical data display system in which photoconductor elements on the back of a screen are connected in series with electroluminescent display and feedback elements which form the front of the screen and an a-c power supply. The photoconductor has a high dark impedance so that in the initial OFF position insufficient a-c power passes through the electroluminescent elements to cause significant light emission. When the photoconductor is illuminated with a light pulse from a scanning laser beam, the impedance drops sharply so that substantially all of the a-c supply voltage is received by the electroluminescent element thereby causing the element to luminesce. The photoconductivity persists long enough for the electroluminescent emission to build up and sustain the low photoconductor impedance via optical feedback. This ON condition is maintained until the power to the device is interrupted for an erase period long enough for the photoconductivity to decay.

REFERENCES:
patent: 3422270 (1969-01-01), Moulton
patent: 3947842 (1976-03-01), Hilsum et al.

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